Page 131 - C++

else
{
node * temp=front;

cout<<” deleted element is “<<temp->rollno<<temp->name;
temp=temp->link;
if ( temp==NULL)
front=rear=NULL;
}}

4. a) Fill in the blanks marked as statement 1 and statement 2 in the program

segment given below with appropriate function for the required task. 1
class agency
{ int ano; // agent code
char aname[20]; // agent name
char mobile[12]; // mobile number
public:
void enter(); // function to enter details of agent
void disp(); //function to display details of agent
int rano(){ return ano;}
void updatemobile() // function to update mobile
{ cout<<” updated mobile: “;
gets(mobile); }
};
void agentupdate()
{ fstream f;
f.open(“agent.dat”, ios::binary|ios::in|ios::out);
int updt=0;
int uano;
cout<<” agent number to update “;
cin>>uano;
agency a;
while(!updt && f.read((char *)&a, sizeof(a)))
{ if(a.rano()==uano)
{
// statement 1 : to call the function to update mobile number
_________________________________________
// statement 2: to reposition file pointer to rewrite the updated object
//back in the file
_________________________________________
f.write((char *)&a, sizeof(a));
updt++; }
if(updt)
cout<<” mobile updated for the agent “<<uano<<endl;
else
cout<<” agent not found “<<endl;
f.close();
}

XII / Comp. Sc. Page 10 of 17